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db block gets - server process to retreive the datablock from datafiles.
Consistent gets - If process gets the datablock it needed from data buffer cache it is consistent get.
Physical read - If process read the block from the datafile not from buffer.
Redo size - it refer to redolog buffer size.
sorts (memory) - If the sorting is done in memory that is allocated for user
.
sorts (disk)- If memory is not available for user that sorting is done in physical media i.e (disk) it degrade the system performance.